WO2020194952A1 - 作業機械 - Google Patents

作業機械 Download PDF

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Publication number
WO2020194952A1
WO2020194952A1 PCT/JP2019/050790 JP2019050790W WO2020194952A1 WO 2020194952 A1 WO2020194952 A1 WO 2020194952A1 JP 2019050790 W JP2019050790 W JP 2019050790W WO 2020194952 A1 WO2020194952 A1 WO 2020194952A1
Authority
WO
WIPO (PCT)
Prior art keywords
clogging
cooling
engine
outside air
temperature
Prior art date
Application number
PCT/JP2019/050790
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
幸次 兵藤
正規 吉川
和之 伊藤
田中　哲二
浩司 島▲崎▼
勇 青木
Original Assignee
日立建機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日立建機株式会社 filed Critical 日立建機株式会社
Priority to EP19921816.5A priority Critical patent/EP3832083B1/de
Priority to CN201980056018.4A priority patent/CN112639263B/zh
Priority to US17/272,673 priority patent/US11401695B2/en
Publication of WO2020194952A1 publication Critical patent/WO2020194952A1/ja

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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/26—Indicating devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K11/00—Arrangement in connection with cooling of propulsion units
    • B60K11/02—Arrangement in connection with cooling of propulsion units with liquid cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K11/00—Arrangement in connection with cooling of propulsion units
    • B60K11/08—Air inlets for cooling; Shutters or blinds therefor
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/226—Safety arrangements, e.g. hydraulic driven fans, preventing cavitation, leakage, overheating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M5/00—Heating, cooling, or controlling temperature of lubricant; Lubrication means facilitating engine starting
    • F01M5/002—Cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/12—Filtering, cooling, or silencing cooling-air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/14—Indicating devices; Other safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/14—Indicating devices; Other safety devices
    • F01P11/16—Indicating devices; Other safety devices concerning coolant temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P5/00—Pumping cooling-air or liquid coolants
    • F01P5/02—Pumping cooling-air; Arrangements of cooling-air pumps, e.g. fans or blowers
    • F01P5/04—Pump-driving arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K11/00—Arrangement in connection with cooling of propulsion units
    • B60K11/02—Arrangement in connection with cooling of propulsion units with liquid cooling
    • B60K11/04—Arrangement or mounting of radiators, radiator shutters, or radiator blinds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/06—Combustion engines, Gas turbines
    • B60W2510/0676—Engine temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2200/00—Type of vehicle
    • B60Y2200/40—Special vehicles
    • B60Y2200/41—Construction vehicles, e.g. graders, excavators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2200/00—Type of vehicle
    • B60Y2200/40—Special vehicles
    • B60Y2200/41—Construction vehicles, e.g. graders, excavators
    • B60Y2200/415—Wheel loaders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2400/00—Special features of vehicle units
    • B60Y2400/30—Sensors
    • B60Y2400/302—Temperature sensors
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/283—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with a single arm pivoted directly on the chassis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00—Measuring
    • F01P2025/08—Temperature
    • F01P2025/13—Ambient temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00—Measuring
    • F01P2025/08—Temperature
    • F01P2025/32—Engine outcoming fluid temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/02—Controlling of coolant flow the coolant being cooling-air
    • F01P7/04—Controlling of coolant flow the coolant being cooling-air by varying pump speed, e.g. by changing pump-drive gear ratio
    • F01P7/044—Controlling of coolant flow the coolant being cooling-air by varying pump speed, e.g. by changing pump-drive gear ratio using hydraulic drives

Definitions

  • the present invention relates to a work machine provided with a cooling device such as a radiator for cooling engine cooling water and an oil cooler for cooling hydraulic oil for operating the work machine.
  • a cooling device such as a radiator for cooling engine cooling water and an oil cooler for cooling hydraulic oil for operating the work machine.
  • the work machine is equipped with a cooling fan that takes in outside air and blows it to the cooling device.
  • the cooling fan takes in dust and the like inside the vehicle body together with the outside air. It ends up. If dust or the like is sent to the cooling device, the cooling device may be clogged and the hydraulic oil or the cooling water of the engine may overheat.
  • the wind speed of the engine cooling air passing through the dust net of the intake port of the engine cooling air is detected by the wind speed sensor, the dust net is clogged, and the detected wind speed by the wind speed sensor is set.
  • the control means outputs a signal to the drive circuit to activate the alarm device, and the alarm device is activated to warn the driver to clean the dust net.
  • the engine cooling fan that takes in the engine cooling air and supplies it to the engine cooling radiator is driven in the reverse rotation direction to blow air toward the intake port, and dust adhering to the dust net of the intake port is removed. It is done by blowing it down.
  • Patent Document 1 activates an alarm device when it detects that clogging has occurred in the dust net, and whether or not the clogging in the dust net is in a continuous state is determined. Not judged. Therefore, since the operator is not notified that the dust net maintenance is required, the operator cannot determine whether the dust net maintenance should be performed.
  • an object of the present invention is to provide a work machine capable of notifying that maintenance is required due to continuous clogging or deterioration of cooling performance in the cooling device.
  • the present invention relates to a main body, an engine mounted on the main body, a working machine attached to the main body and driven by hydraulic pressure, and at least cooling water for cooling the engine or the work.
  • a work machine equipped with a cooling device that cools the hydraulic oil that operates the machine and a cooling fan that takes in outside air and blows it to the cooling device, an outside air temperature sensor that detects the temperature of the outside air and at least the cooling water.
  • a fluid temperature sensor that detects the temperature or the temperature of the hydraulic oil, a controller that determines the continuous state of clogging in the cooling device, and the fact that maintenance of the cooling device is required due to the continuation of clogging in the cooling device.
  • the controller includes a notification device for notifying, and whether or not the cooling device is clogged based on the outside air temperature detected by the outside air temperature sensor and the fluid temperature detected by the fluid temperature sensor. Is determined, and based on the rate of occurrence of clogging in the cooling device while the engine is operating, it is determined whether or not clogging continues in the cooling device, and clogging continues in the cooling device. When it is determined that the cooling device is being used, a notification command signal for instructing the notification device to notify that maintenance of the cooling device is required is output.
  • FIG. 1 is a side view showing the appearance of the wheel loader 1 according to each embodiment of the present invention.
  • the wheel loader 1 is an articulated work vehicle that is steered by bending the vehicle body (main body) near the center. Specifically, the front frame 1A, which is the front part of the vehicle body, and the rear frame 1B, which is the rear part of the vehicle body, are rotatably connected in the left-right direction by the center joint 10, and the front frame 1A is connected to the rear frame 1B. On the other hand, it bends in the left-right direction.
  • the front frame 1A is provided with a pair of left and right front wheels 11A
  • the rear frame 1B is provided with a pair of left and right rear wheels 11B
  • the entire vehicle body is provided with four wheels. Note that, of the four wheels, only the left front wheel 11A and the left rear wheel 11B are shown in FIG.
  • a hydraulically driven work machine 2 is attached to the front part of the front frame 1A.
  • the work machine 2 includes a lift arm 21 having a base end attached to the front frame 1A, two lift arm cylinders 22 for driving the lift arm 21, a bucket 23 attached to the tip of the lift arm 21, and a bucket.
  • Pressure is applied to the bucket cylinder 24 that drives the 23, the bell crank 25 that is rotatably connected to the lift arm 21 to form a link mechanism between the bucket 23 and the bucket cylinder 24, and the two lift arm cylinders 22 and the bucket cylinder 24.
  • It has a plurality of pipes (not shown) for guiding oil.
  • the two lift arm cylinders 22 and the bucket cylinder 24 are aspects of a hydraulic actuator that drives the work machine 2, respectively.
  • Each of the two lift arm cylinders 22 rotates the lift arm 21 in the vertical direction with respect to the front frame 1A as the hydraulic oil flows in and out and the rod 220 expands and contracts.
  • the lift arm 21 is supplied with hydraulic oil to the bottom chambers of the two lift arm cylinders 22 and rotates upward by extending the rod 220, and the hydraulic oil is supplied to the rod chambers of the two lift arm cylinders 22. As the rod 220 contracts, it rotates downward.
  • FIG. 1 of the two lift arm cylinders 22 arranged in the left-right direction of the vehicle body only the lift arm cylinder 22 arranged on the left side is shown by a broken line.
  • the bucket cylinder 24 rotates the bucket 23 in the vertical direction with respect to the lift arm 21 as the hydraulic oil flows in and out and the rod 240 expands and contracts.
  • the bucket 23 is tilted (rotated upward with respect to the lift arm 21) by supplying hydraulic oil to the bottom chamber of the bucket cylinder 24 and extending the rod 240, and the hydraulic oil is supplied to the rod chamber of the bucket cylinder 24.
  • the bucket 23 can be replaced with various attachments such as blades, and can perform various operations such as soil pushing work and snow removal work in addition to excavation work using the bucket 23.
  • the driver's cab 12 on which the operator is boarded, the machine room 13 for accommodating each device such as an engine, hydraulic pump, and controller, which will be described later, and the working machine 2 are balanced so that the vehicle body does not tilt.
  • a counter weight 14 for holding is provided.
  • the driver's cab 12 is arranged at the front, the counterweight 14 is arranged at the rear, and the machine room 13 is arranged between the driver's cab 12 and the counterweight 14.
  • a cooling unit 3 for cooling the cooling water for cooling the engine and the hydraulic oil for operating the working machine 2 is mounted on the rear side in the machine room 13.
  • FIG. 2 is a configuration diagram showing a configuration example of the cooling unit 3.
  • the cooling unit 3 includes an engine 30, a radiator 31 as a cooling device for cooling the cooling water for cooling the engine 30, an oil cooler 32 as a cooling device for cooling the hydraulic oil for operating the working machine 2, and outside air (cooling). It includes a cooling fan 33 that takes in wind) and blows it to the radiator 31 and the oil cooler 32, and a cooling fan driving device 39 that drives the cooling fan 33.
  • the cooling fan drive device 39 switches between the hydraulic motor 34 that rotates the cooling fan 33, the hydraulic pump 35 that supplies hydraulic oil to the hydraulic motor 34, and the flow direction of the hydraulic oil supplied from the hydraulic pump 35 to the hydraulic motor 34. It includes a direction switching valve 36 and a variable relief valve 37 that adjusts the rotational speed of the hydraulic motor 34.
  • the radiator 31 exchanges heat with the cooling air sent from the cooling fan 33, and cools the cooling water heated by the engine 30.
  • the cooling water cooled by the radiator 31 returns to the engine 30 again.
  • the temperature of the cooling water is detected by the cooling water temperature sensor 41 provided on the inlet side of the radiator 31.
  • the oil cooler 32 exchanges heat with the cooling air sent from the cooling fan 33, is discharged from a cargo handling hydraulic pump (not shown) different from the hydraulic pump 35, and is heated by each hydraulic actuator. Cool the hydraulic oil.
  • the hydraulic oil cooled by the oil cooler 32 returns to the hydraulic oil tank 38.
  • the temperature of the hydraulic oil is detected by the hydraulic oil temperature sensor 42 provided on the inlet side of the oil cooler 32.
  • the hydraulic oil temperature sensor 42 does not necessarily have to be provided on the inlet side of the oil cooler 32, and may be provided, for example, in the hydraulic oil tank 38.
  • the engine 30 operates (starts) when the operator operates the ignition switch 121 to ON, and further rotates when the accelerator pedal 122 is depressed.
  • the rotation speed of the engine 30 is proportional to the depression amount of the accelerator pedal 122, and the rotation speed of the engine 30 increases as the depression amount of the accelerator pedal 122 increases.
  • Both the ignition switch 121 and the accelerator pedal 122 are provided in the driver's cab 12 (see FIG. 1).
  • the hydraulic pump 35 is connected to the engine 30 via the output shaft 30A and is driven by the rotational force of the engine 30.
  • the discharge flow rate of the hydraulic pump 35 fluctuates according to the rotation speed of the engine 30, and the discharge flow rate of the hydraulic pump 35 increases as the rotation speed of the engine 30 increases.
  • a fixed capacity type hydraulic pump is used for the hydraulic pump 35.
  • the directional control valve 36 is an electromagnetic directional switching valve, and is provided between the hydraulic pump 35 and the hydraulic motor 34. Specifically, the direction switching valve 36 is connected to the discharge port of the hydraulic pump 35 by the discharge pipe line 301, and to the outflow port of the hydraulic motor 34 by the pair of connection pipe lines 302A and 302B, respectively. Further, the direction switching valve 36 is connected to the hydraulic oil tank 38 by the discharge pipe line 303.
  • the forward rotation position L for rotating the hydraulic motor 34 in the forward direction and the reverse rotation position M for rotating the hydraulic motor 34 in the reverse direction are switched at a predetermined interval time according to the switching command signal output from the controller 5. ..
  • the cooling fan 33 connected to the hydraulic motor 34 via the output shaft 34A of the hydraulic motor 34 repeatedly rotates forward and reverse at a predetermined interval time.
  • the hydraulic oil discharged from the hydraulic pump 35 is supplied to the hydraulic motor 34 via the discharge pipe 301 and one of the connecting pipes 302A.
  • the hydraulic oil supplied to the hydraulic motor 34 is discharged to the hydraulic oil tank 38 via the other connecting pipe line 302B and the discharge pipe line 303. As a result, the hydraulic motor 34 rotates in the positive direction.
  • the variable relief valve 37 is an electromagnetic variable relief valve, and is provided between the discharge pipe line 301 and the discharge pipe line 303.
  • the variable relief valve 37 defines the maximum pressure of the hydraulic oil supplied from the hydraulic pump 35 to the hydraulic motor 34 according to the command signal output from the controller 5, and controls the pressure on the discharge side of the hydraulic pump 35.
  • the rotation speed of the hydraulic motor 34 can be controlled to adjust the rotation speed of the cooling fan 33.
  • the discharge pipe line 301 is provided with a pressure sensor 43 that detects the pressure on the discharge side of the hydraulic pump 35.
  • the wheel loader 1 is often used at a work site where dust and the like are likely to fly, and the cooling fan 33 takes in the dust and the like into the machine room 13 together with the outside air. Therefore, each of the radiator 31 and the oil cooler 32 is provided with a dustproof filter (not shown) for preventing the intrusion of dust and the like on the side facing the cooling fan 33. If the dust filter is clogged, the cooling performance will deteriorate, and the cooling water and hydraulic oil may overheat.
  • the direction switching valve 36 is controlled by the controller 5 to repeatedly rotate the cooling fan 33 in the forward and reverse directions at a predetermined interval time to remove dust and the like clogged in the dust filter.
  • the controller 5 sets the predetermined interval time as the total time of the time when the cooling fan 33 rotates in the forward direction and the time when the cooling fan 33 rotates in the reverse direction, but the present invention is not limited to this.
  • the time during which the cooling fan 33 is rotating in the forward direction may be set as a predetermined interval time, and then the cooling fan 33 may be rotated in the reverse direction for a predetermined time.
  • the cooling water temperature CW detected by the cooling water temperature sensor 41, the hydraulic oil temperature HW detected by the hydraulic oil temperature sensor 42, and the outside air temperature AW detected by the outside air temperature sensor 44 are input to the controller 5, respectively. It is used to determine the clogging of the radiator 31 and the oil cooler 32.
  • the outside air temperature sensor 44 is provided at a predetermined position on the outer surface of the vehicle body (for example, the side surface of the rear frame 1B) to which the outside air comes into contact.
  • the controller 5 determines not only the occurrence of clogging of the radiator 31 and the oil cooler 32 but also the continuous state of clogging in the radiator 31 and the oil cooler 32, and determines that the radiator 31 and the user management system 62 are in a continuous state of clogging. It outputs a notification command signal that commands notification that maintenance of 31 and the oil cooler 32 is necessary.
  • the alarm buzzer 61 is provided in the driver's cab 12 (see FIG. 1), issues an alarm based on the notification command signal output from the controller 5, and the radiator 31 and the oil cooler 32 continue to be clogged. Notify the operator that inspection is required.
  • the user management system 62 is a management system installed on the user side that owns the wheel loader 1, is connected to the controller 5 via the communication network 62A, and is a service inspection report based on the notification command signal output from the controller 5. To receive.
  • the alarm buzzer 61 and the user management system 62 are one aspect of a notification device that notifies that maintenance is required due to continuous clogging of the radiator 31 and the oil cooler 32, respectively.
  • the notification device is not limited to the alarm buzzer 61 or the user management system 62 as long as it can notify the necessity of maintenance due to continuous clogging of the radiator 31 and the oil cooler 32.
  • the functional configuration of the controller 5 will be described for each embodiment.
  • FIG. 3 is a functional block diagram showing the functions of the controller 5 according to the first embodiment.
  • 4 (a) and 4 (b) are timing charts showing the relationship between the cooling water temperature CW or the hydraulic oil temperature HW and the interval time between the forward and reverse rotations of the cooling fan 33, and FIG. 4 (a) is a low temperature. Under conditions, FIG. 4B shows the case under high temperature conditions.
  • the controller 5 is configured by connecting the CPU, RAM, ROM, HDD, input I / F, and output I / F to each other via a bus. Then, various operating devices such as the ignition switch 121, various sensors such as the cooling water temperature sensor 41, the hydraulic oil temperature sensor 42, and the outside air temperature sensor 44 are connected to the input I / F, and the direction switching valve 36 and the alarm buzzer are connected. The 61 and the user management system 62 and the like are connected to the output I / F.
  • the CPU reads a control program (software) stored in a recording medium such as a ROM, HDD, or optical disk, expands it on the RAM, and executes the expanded control program for control.
  • a control program software stored in a recording medium such as a ROM, HDD, or optical disk
  • the program and the hardware work together to realize the function of the controller 5.
  • the controller 5 is described as a computer configured by a combination of software and hardware, but the present invention is not limited to this, and for example, as an example of the configuration of another computer, the wheel loader 1 side.
  • An integrated circuit that realizes the function of the controller to be executed may be used.
  • the controller 5 includes a data acquisition unit 50, an engine state determination unit 51, a clogging occurrence determination unit 52, an interval time setting unit 53, an interval time storage unit 54, and a reverse rotation speed count.
  • a unit 55, a clogging occurrence rate calculation unit 56, a clogging continuation determination unit 57, a threshold storage unit 58, and a command signal output unit 59 are included.
  • the data acquisition unit 50 uses an operation signal output from the ignition switch 121, a cooling water temperature CW detected by the cooling water temperature sensor 41, a hydraulic oil temperature HW detected by the hydraulic oil temperature sensor 42, and an outside air temperature sensor 44.
  • the data regarding the detected outside air temperature AW is acquired respectively.
  • the engine state determination unit 51 determines the ON state or OFF state of the ignition switch 121, that is, the operating state of the engine 30, based on the operation signal from the ignition switch 121 acquired by the data acquisition unit 50.
  • the clogging occurrence determination unit 52 includes an outside air temperature determination unit 52A and a fluid temperature determination unit 52B, and the engine state determination unit 51 determines that the engine 30 is operating (the ignition switch 121 is in the ON state). If this is the case, it is determined whether or not at least the radiator 31 or the oil cooler 32 is clogged based on the determination results of the outside air temperature determination unit 52A and the fluid temperature determination unit 52B.
  • the outside air temperature determination unit 52A determines whether or not the outside air temperature AW acquired by the data acquisition unit 50 is lower than the predetermined outside air temperature threshold value AWth (hereinafter, simply referred to as “outside air temperature threshold value AWth”).
  • the case where the outside air temperature AW is lower than the outside air temperature threshold value AWth is defined as "low temperature condition" (AW ⁇ AWth), and the case where the outside air temperature AW is equal to or higher than the outside air temperature threshold value AWth is defined as "high temperature condition" (AW ⁇ AWth).
  • AWth low temperature condition
  • the fluid temperature determination unit 52B determines that the outside air temperature AW is lower than the outside air temperature threshold AWth (AW ⁇ AWth) by the outside air temperature determination unit 52A, the cooling water acquired by the data acquisition unit 50 It is determined whether or not the temperature CW or the hydraulic oil temperature HW has reached a predetermined first fluid temperature threshold W1 (hereinafter, simply referred to as “first fluid temperature threshold W1”). Then, when the cooling water temperature CW or the hydraulic oil temperature HW reaches the first fluid temperature threshold W1 (CW ⁇ W1 or HW ⁇ W1), the fluid temperature determination unit 52B then operates the cooling water temperature CW or the operation. It is determined whether or not the oil temperature HW has fallen below a predetermined third fluid temperature threshold W3 (hereinafter, simply “third fluid temperature threshold W3”) lower than the first fluid temperature threshold W1.
  • first fluid temperature threshold W1 hereinafter, simply referred to as “first fluid temperature threshold W1”.
  • the first fluid temperature threshold value W1 is a reference value on the high temperature side under low temperature conditions, and is set to, for example, 91 ° C.
  • the third fluid temperature threshold value W3 is a reference value on the low temperature side under low temperature conditions, and is set to, for example, 88 ° C.
  • the fluid temperature determination unit 52B is acquired by the data acquisition unit 50. It is determined whether or not the cooling water temperature CW or the hydraulic oil temperature HW has reached a predetermined second fluid temperature threshold W2 (hereinafter, simply referred to as “second fluid temperature threshold W2”). Then, when the cooling water temperature CW or the hydraulic oil temperature HW reaches the second fluid temperature threshold W2 (CW ⁇ W2 or HW ⁇ W2), the fluid temperature determination unit 52B then operates the cooling water temperature CW or the operation. It is determined whether or not the oil temperature HW has fallen below a predetermined fourth fluid temperature threshold W4 (hereinafter, simply "fourth fluid temperature threshold W4") lower than the second fluid temperature threshold W2.
  • fourth fluid temperature threshold W4 hereinafter, simply "fourth fluid temperature threshold W4"
  • the second fluid temperature threshold value W2 is a reference value on the high temperature side under high temperature conditions, and is set to, for example, 95 ° C.
  • the fourth fluid temperature threshold value W4 is a reference value on the low temperature side under high temperature conditions, and is set to, for example, 90 ° C.
  • the first to fourth fluid temperature thresholds W1 to W4 are provided on the pipeline connecting the engine 30 and the radiator 31, respectively, and the cooling water temperature from the fully closed to the fully opened thermostat that opens and closes the pipeline. It is set based on the range of (for example, 85 to 95 ° C.).
  • the range of the cooling water temperature corresponding to the low temperature condition is set in the range of the cooling water temperature from the fully closed to the fully opened thermostat.
  • a cooling water temperature range corresponding to a high temperature condition is set in the cooling water temperature range from the fully closed to the fully opened thermostat.
  • the first fluid temperature threshold W1 is lower than the second fluid temperature threshold W2 (W1 ⁇ W2), and the third fluid temperature threshold W3 is the fourth fluid. It is lower than the temperature threshold W4 (W3 ⁇ W4).
  • the first fluid temperature threshold W1 is within the range of the cooling water temperature (95 ° C.) or higher at which the thermostat is fully opened
  • the second fluid temperature threshold W2 is within the range of the cooling water temperature (95 ° C.) or higher at which the thermostat is fully open. And each is set.
  • the clogging occurrence determination unit 52 determines that the outside air temperature determination unit 52A is under low temperature conditions (AW ⁇ AWth), and the fluid temperature determination unit 52B determines that the cooling water temperature CW or the hydraulic oil temperature HW is the first fluid temperature threshold. When it is determined that W1 has been reached (CW ⁇ W1 or HW ⁇ W1), or the outside air temperature determination unit 52A determines that the condition is high temperature (AW ⁇ AWth), and the fluid temperature determination unit 52B determines that the cooling water is When it is determined that the temperature CW or the hydraulic oil temperature HW has reached the second fluid temperature threshold W2 (CW ⁇ W2 or HW ⁇ W2), at least the radiator 31 or the oil cooler 32 is clogged (hereinafter, It is simply determined that "clogging is occurring").
  • the first fluid temperature threshold W1 and the second fluid temperature threshold W2 both have a temperature Wmax (for example, 105) when the cooling water for cooling the engine 30 or the hydraulic oil for operating the working machine 2 overheats. Because it is set lower than (° C.) (W1 ⁇ Wmax and W2 ⁇ Wmax), operators and users can signal that the cooling water that cools the engine 30 or the hydraulic fluid that operates the work equipment 2 actually overheats. Can be grasped.
  • Wmax for example, 105
  • the clogging occurrence determination unit 52 is determined by the outside air temperature determination unit 52A to be under low temperature conditions (AW ⁇ AWth), and the cooling water temperature CW or the hydraulic oil temperature HW is determined by the fluid temperature determination unit 52B.
  • the determination unit 52B determines that the cooling water temperature CW or the hydraulic oil temperature HW has dropped below the fourth fluid temperature threshold W4 (CW ⁇ W4 or HW ⁇ W4), the radiator 31 and the oil cooler 32 are clogged. It is determined that the problem has been resolved (hereinafter, simply referred to as "clogging clear").
  • the interval time setting unit 53 rotates the cooling fan 33 in the forward and reverse directions when the engine state determination unit 51 determines that the engine 30 is operating (the ignition switch 121 is in the ON state).
  • interval time is set to the normal interval time T1.
  • This normal interval time T1 is an initially set interval time, and is set to, for example, 30 minutes.
  • the interval time setting unit 53 rotates the cooling fan 33 in the forward and reverse directions when the clogging occurrence determination unit 52 determines that clogging is occurring.
  • the interval time to be caused is set to a shortened interval time T2 (for example, 20 minutes) shorter than the normal interval time T1.
  • the interval time for rotating the cooling fan 33 in the forward and reverse directions is returned (released) from the shortened interval time T2 to the normal interval time T1.
  • the interval time storage unit 54 stores the normal interval time T1 and the shortened interval time T2, respectively.
  • the reverse rotation speed counting unit 55 counts the number of times that the command signal output unit 59 outputs the reverse rotation command signal to the direction switching valve 36 while the engine 30 is operating.
  • the reverse rotation command signal is a command signal for switching the cooling fan 33 from forward rotation to reverse rotation.
  • the reverse rotation number counting unit 55 is the cumulative output number TN (hereinafter, simply “") in which the command signal output unit 59 outputs the reverse rotation command signal to the direction switching valve 36 while the engine 30 is operating. Cumulative output count TN ”), and while the clogging occurrence determination unit 52 determines that clogging is occurring, the command signal output unit 59 outputs a reverse rotation command signal to the direction switching valve 36.
  • Each signal output count CN (hereinafter, simply referred to as “clogging signal output count CN”) is counted.
  • the clogging occurrence rate calculation unit 56 counts the cumulative number of outputs counted by the reverse rotation number counting unit 55.
  • the clogging continuation determination unit 57 determines whether or not the clogging continues at least by the radiator 31 or the oil cooler 32 based on the clogging occurrence rate R1 calculated by the clogging occurrence rate calculation unit 56. Specifically, in the clogging continuation determination unit 57, the clogging occurrence rate R1 calculated by the clogging occurrence rate calculation unit 56 is equal to or higher than a predetermined ratio threshold value R1th (hereinafter, simply referred to as “ratio threshold value R1th”). Judge whether or not.
  • the ratio threshold value R1th is set to, for example, 60%.
  • the threshold storage unit 58 stores the outside air temperature threshold AWth, the first to fourth fluid temperature thresholds W1 to W4, and the ratio threshold R1th, respectively.
  • the command signal output unit 59 transmits a switching command signal to the direction switching valve 36 so that the cooling fan 33 rotates forward and reverse at the interval time set by the interval time setting unit 53, that is, the normal interval time T1 or the shortened interval time T2. And output.
  • the switching command signal includes the above-mentioned reverse rotation command signal and a forward rotation command signal for switching the cooling fan 33 from reverse rotation to forward rotation.
  • command signal output unit 59 is determined by the clogging continuation determination unit 57 that at least the radiator 31 or the oil cooler 32 is clogged (hereinafter, simply referred to as “clogging is continuing”).
  • a notification command signal is output to the alarm buzzer 61 and the user management system 62.
  • FIG. 5 is a flowchart showing the flow of the entire process executed by the controller 5 according to the first embodiment.
  • FIG. 6 is a flowchart showing the flow of the clogging continuation determination process executed by the controller 5 according to the first embodiment.
  • FIG. 7 is an explanatory diagram illustrating a method of determining the continuation of clogging in the first embodiment.
  • the engine state determination unit 51 determines whether or not the engine 30 has been operated based on the operation signal from the ignition switch 121 acquired by the data acquisition unit 50 (step S501). ..
  • step S501 When it is determined in step S501 that the engine 30 has been operated (step S501 / YES), the interval time setting unit 53 sets the interval time for rotating the cooling fan 33 in the forward and reverse directions to the normal interval time T1 and commands signal output unit. 59 outputs a switching command signal based on the normal interval time T1 to the direction switching valve 36 (step S502). If it is not determined in step S501 that the engine 30 has been activated (step S501 / NO), the process does not proceed to step S502 or later until the engine 30 is activated.
  • the reverse rotation speed counting unit 55 counts the output number of the reverse rotation command signal among the switching command signals output in step S502 (step S503).
  • the data acquisition unit 50 sets the outside air temperature AW detected by the outside air temperature sensor 44, the cooling water temperature CW detected by the cooling water temperature sensor 41, and the hydraulic oil temperature HW detected by the hydraulic oil temperature sensor 42, respectively. Acquire (step S504).
  • the outside air temperature determination unit 52A determines whether or not the outside air temperature AW acquired in step S504 is lower than the outside air temperature threshold value AWth (step S505).
  • the fluid temperature determination unit 52B acquires in step S504. It is determined whether or not the cooling water temperature CW or the hydraulic oil temperature HW is equal to or higher than the first fluid temperature threshold W1 (step S506).
  • step S506 When it is determined in step S506 that the cooling water temperature CW or the hydraulic oil temperature HW is equal to or higher than the first fluid temperature threshold value W1 (CW ⁇ W1 or HW ⁇ W1) (step S506 / YES), that is, it is determined that clogging is occurring. Therefore, the interval time setting unit 53 sets the interval time for rotating the cooling fan 33 in the forward and reverse directions to the shortened interval time T2, and the command signal output unit 59 directs the switching command signal based on the shortened interval time T2. Output to the switching valve 36 (step S507).
  • the fluid temperature determination unit 52B determines whether or not the cooling water temperature CW or hydraulic oil temperature HW acquired in step S504 is equal to or lower than the third fluid temperature threshold value W3 (step S508).
  • the interval time setting unit 53 sets the interval time for rotating the cooling fan 33 in the forward and reverse directions to the normal interval time T1 (cancels the setting of the shortened interval time T2), and the command signal output unit 59 sets the normal interval.
  • a switching command signal based on the time T1 is output to the direction switching valve 36 (step S509).
  • step S508 When it is determined in step S508 that the cooling water temperature CW or the hydraulic oil temperature HW is higher than the third fluid temperature threshold W3 (CW> W3 or HW> W3) (step S508 / NO), the cooling water temperature CW Alternatively, the process returns to step S507 and the process is repeated until the hydraulic oil temperature HW becomes equal to or lower than the third fluid temperature threshold W3.
  • step S506 When it is determined in step S506 that the cooling water temperature CW or the hydraulic oil temperature HW is lower than the first fluid temperature threshold value W1 (CW ⁇ W1 or HW ⁇ W1) (step S506 / NO), clogging is not occurring. Therefore, the process proceeds to step S509.
  • step S505 when it is determined in step S505 that the outside air temperature AW is equal to or higher than the outside air temperature threshold value AWth (AW ⁇ AWth) (step S505 / NO), that is, under high temperature conditions, the fluid temperature determination unit 52B performs step S504. It is determined whether or not the cooling water temperature CW or the hydraulic oil temperature HW acquired in step 2 is equal to or higher than the second fluid temperature threshold value W2 (step S510).
  • step S510 When it is determined in step S510 that the cooling water temperature CW or the hydraulic oil temperature HW is equal to or higher than the second fluid temperature threshold value W2 (CW ⁇ W2 or HW ⁇ W2) (step S510 / YES), that is, it is determined that clogging is occurring. Therefore, similarly to step S507, the interval time setting unit 53 sets the interval time for rotating the cooling fan 33 in the forward and reverse directions to the shortened interval time T2, and the command signal output unit 59 is based on the shortened interval time T2. The switching command signal is output to the direction switching valve 36 (step S511).
  • the fluid temperature determination unit 52B determines whether or not the cooling water temperature CW or hydraulic oil temperature HW acquired in step S504 is equal to or less than the fourth fluid temperature threshold value W4 (step S512).
  • the interval time setting unit 53 sets the interval time for rotating the cooling fan 33 in the forward and reverse directions to the normal interval time T1, and the command signal output unit 59 is based on the normal interval time T1.
  • the switching command signal is output to the direction switching valve 36 (step S513).
  • step S512 When it is determined in step S512 that the cooling water temperature CW or the hydraulic oil temperature HW is higher than the fourth fluid temperature threshold W4 (CW> W4 or HW> W4) (step S512 / NO), the cooling water temperature CW Alternatively, the process returns to step S511 and the process is repeated until the hydraulic oil temperature HW becomes equal to or lower than the fourth fluid temperature threshold W4.
  • step S510 When it is determined in step S510 that the cooling water temperature CW or the hydraulic oil temperature HW is lower than the second fluid temperature threshold value W2 (CW ⁇ W2 or HW ⁇ W2) (step S510 / NO), clogging is not occurring. , Step S513.
  • step S509 or step S513 the engine state determination unit 51 determines whether or not the engine 30 has stopped based on the operation signal from the ignition switch 121 acquired by the data acquisition unit 50 (step S514). ..
  • step S514 the process proceeds to the clogging continuation determination process (step S700). If it is not determined in step S514 that the engine 30 has stopped (step S514 / NO), that is, if the engine 30 is still in operation, the process returns to step S502 and the process is repeated.
  • the clogging occurrence rate calculation unit 56 is based on the number of output times of the reverse rotation command signal counted in step S503 shown in FIG.
  • the clogging continuation determination unit 57 determines whether or not the clogging occurrence rate R1 calculated in step S701 is equal to or higher than the rate threshold value R1th (step S702).
  • the command signal output unit 59 determines.
  • a notification command signal is output to the alarm buzzer 61 (step S703), and a notification command signal is output to the user management system 62 (step S704).
  • the controller 5 ends the clogging continuation determination process (step S700) and ends the entire process.
  • step S702 When it is determined in step S702 that the clogging occurrence rate R1 is less than the rate threshold value R1th (R1 ⁇ R1th) (step S702 / NO), that is, the clogging does not continue, the controller 5 continues the clogging.
  • the determination process (step S700) is terminated, and the entire process is terminated.
  • FIG. 7 shows a continuous state of clogging per day operating time of the engine 30 when the outside air temperature AW is 25 ° C., that is, under low temperature conditions.
  • the reverse rotation command signals output by the command signal output unit 59 to the direction switching valve 36 from the start (operation) to the stop of the engine 30 are (1) to (1) to (1). 8), of which the reverse rotation command signal output by the command signal output unit 59 to the direction switching valve 36 during clogging is 6 times (2) to (7).
  • the controller 5 determines that the clogging continues.
  • a notification command signal is output to the alarm buzzer 61 and the user management system 62.
  • the notification device such as the alarm buzzer 61 and the user management system 62 notifies the operator and the user that at least the radiator 31 or the oil cooler 32 is continuously clogged and maintenance is required. And the user can determine that the situation is such that the radiator 31 and the oil cooler 32 should be maintained.
  • the clogging occurrence rate R1 during the operation of the engine 30 is set to the daily operation of the engine 30.
  • the continuation of clogging can be accurately determined.
  • the clogging occurrence rate R1 during the operation of the engine 30 may be calculated by the operating time of the engine 30 per month, which will be described later as a modification.
  • the interval time setting unit 53 sets the interval time for forward / reverse rotation of the cooling fan 33 shorter than the normal interval time T1. Since the shortened interval time is set to T2 (T2 ⁇ T1), the number of times the reverse rotation command signal is output during the occurrence of clogging increases, the clogging occurrence rate R1 also increases, and the continuation of clogging can be determined more accurately. ..
  • FIGS. 8 to 11 the components common to those described for the wheel loader 1 according to the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.
  • FIG. 8 is a functional block diagram showing the functions of the controller 5A according to the second embodiment.
  • FIG. 9 is a flowchart showing the flow of the entire process executed by the controller 5A according to the second embodiment.
  • FIG. 10 is a flowchart showing the flow of the clogging continuation determination process executed by the controller 5A according to the second embodiment.
  • FIG. 11 is an explanatory diagram illustrating a method of determining the continuation of clogging in the second embodiment. Note that, as in FIG. 7, FIG. 11 shows a continuous state of clogging per day operating time of the engine 30 when the outside air temperature AW is 25 ° C., that is, under low temperature conditions.
  • the controller 5A according to the present embodiment is different from the controller 5 according to the first embodiment in the method of determining the continuation of clogging.
  • the controller 5 according to the first embodiment includes the reverse rotation speed counting unit 55, but the controller 5A according to the present embodiment uses a measuring unit 550 instead of the reverse rotation speed counting unit 55 as shown in FIG. Includes.
  • the measuring unit 550 includes an engine operating time measuring unit 550A and a clogging determination time measuring unit 550B.
  • the engine operating time measuring unit 550A measures the time ET during which the engine 30 is operating (hereinafter, simply referred to as "engine operating time ET").
  • step S501 when it is determined in step S501 that the engine 30 has been activated (step S501 / YES), the engine operating time measuring unit 550A starts measuring the engine operating time ET (step). S515). Then, when it is determined in step S514 that the engine 30 has stopped (step S514 / YES), the engine operating time measuring unit 550A ends the measurement of the engine operating time ET (step S520).
  • the clogging determination time measuring unit 550B has a clogging determination time JT in which at least the radiator 31 or the oil cooler 32 is determined to be clogged by the clogging occurrence determination unit 52 (hereinafter, simply “clogging determination time JT”. ”) Is measured.
  • step S506 when it is determined in step S506 that the cooling water temperature CW or the hydraulic oil temperature HW is equal to or higher than the first fluid temperature threshold value W1 (CW ⁇ W1 or HW ⁇ W1) (step). S506 / YES), the clogging determination time measuring unit 550B starts measuring the clogging determination time JT (step S516). Then, when it is determined in step S508 that the cooling water temperature CW or the hydraulic oil temperature HW is equal to or less than the third fluid temperature threshold value W3 (CW ⁇ W3 or HW ⁇ W3) (step S508 / YES), the clogging determination time is measured. Unit 550B ends the measurement of the clogging determination time JT (step S517).
  • step S700A when the measurement of the engine operating time ET is completed in step S520, the process proceeds to the clogging continuation determination process (step S700A).
  • the generation rate R2 is calculated (step S701A).
  • the clogging continuation determination unit 57A determines whether or not the clogging occurrence rate R2 calculated in step S701A is equal to or higher than the rate threshold value R2th (step S702A).
  • the ratio threshold value R2th is set to, for example, 50%.
  • step S702A When it is determined in step S702A that the clogging occurrence rate R2 is equal to or higher than the rate threshold value R2th (R2 ⁇ R2th) (step S702A / YES), the process proceeds to step S703 and step S704.
  • step S702A When it is determined in step S702A that the clogging occurrence rate R2 is smaller than the rate threshold value R2th (R2 ⁇ R2th) (step S702A / NO), the clogging continuation determination process (step S700A) is terminated and the entire process is performed. finish.
  • the engine operating time ET measured by the engine operating time measuring unit 550A is 200 minutes, and the clogging determination time is measured.
  • the clogging determination time JT measured by the unit 550B is 124 minutes
  • the clogging occurrence rate R2 calculated from the engine operating time ET and the clogging determination time JT is used. It is also possible.
  • the wheel loader 1 according to the present embodiment also exhibits the same actions and effects as the actions and effects of the wheel loader 1 according to the first embodiment.
  • the embodiment of the present invention has been described above.
  • the present invention is not limited to the above-described embodiment, and includes various modifications.
  • a modified example of the controller 5A according to the second embodiment will be described with reference to FIGS. 12 (a) and 12 (b).
  • FIG. 12 (a) and 12 (b) are timing charts showing the relationship between the determination of the deterioration in cooling performance and the time measurement in the modified example, and FIG. 12 (a) is FIG. 12 (b) under low temperature conditions. ) Is the case under high temperature conditions.
  • 5A is a cooling performance deteriorated state S2 in which the cooling performance of the radiator 31 or the oil cooler 32 is lowered when the cooling water temperature CW or the hydraulic oil temperature HW becomes the first fluid temperature threshold W1 or more (CW ⁇ W1 or HW ⁇ W1). It is determined that there is, and the time during which the cooling performance deteriorated state S2 continues is cumulatively measured.
  • the controller 5A has a cooling performance in which the cooling performance of the radiator 31 or the oil cooler 32 is normal. It may be determined that the normal state S1 is determined, and the cumulative measurement of the time during which the cooling performance deteriorated state S2 continues may be stopped.
  • the controller 5A has a cooling water temperature CW or hydraulic oil temperature HW equal to or higher than the second fluid temperature threshold value W2 (CW ⁇ W3 or HW ⁇ HW ⁇ ). W3), it is determined that the cooling performance deteriorated state S2, and the time during which the cooling performance deteriorated state S2 continues is cumulatively measured. Then, when the cooling water temperature CW or the hydraulic oil temperature HW becomes equal to or lower than the fourth fluid temperature threshold value W4 (CW ⁇ W4 or HW ⁇ W4), the controller 5A determines that the cooling performance is in the normal state S1 and is in the cooling performance deteriorated state. The cumulative measurement of the duration of S2 may be stopped.
  • FIG. 13 is a diagram displaying the determination result of the cooling performance in the modified example.
  • the controller 5A records the engine operating time ET and the time DT during which the cooling performance of the radiator 31 or the oil cooler 32 is deteriorated (hereinafter, simply referred to as "cooling performance deterioration time DT") as cumulative times, and this month,
  • the determination result of the cooling performance may be shown on a monthly basis as in the case of last month or the month before last.
  • the stage of clogging or deterioration of cooling performance may be displayed by dividing the level according to the numerical value.
  • the DT / ET is 75% or more (DT / ET ⁇ 75%), it is set as abnormal level 3, and "The cooling device is clogged or the cooling system is abnormal. Check immediately. . ”, Etc. in the service inspection report.
  • DT / ET is 50% or more and less than 75% (50% ⁇ DT / ET ⁇ 70%), it is regarded as abnormal level 2, and "the cooling device is clogged or the cooling system is abnormal. Please check it. ”And so on in the service inspection report.
  • DT / ET is less than 50% (DT / ET ⁇ 50%), it is set as normal level 1, and a service inspection report such as "There is no clogging in the cooling device. The cooling system is normal.” It may be described in.
  • the cooling water temperature sensor 41 is provided for the radiator 31 and the hydraulic oil temperature sensor 42 is provided for the oil cooler 32.
  • the radiator 31 is clogged and the cooling water temperature is high.
  • the hydraulic oil temperature HW is also rising. Therefore, if either the cooling water temperature CW or the hydraulic oil temperature HW is detected by the sensor. It is enough. Therefore, the wheel loader 1 may include at least a fluid temperature sensor (cooling water temperature sensor 41 or hydraulic oil temperature sensor 42) that detects the cooling water temperature CW or the hydraulic oil temperature HW.
  • the interval time setting unit 53 shortens the interval time for rotating the cooling fan 33 in the forward and reverse directions to be shorter than the normal interval time T1 when the clogging occurrence determination unit 52 determines that clogging is occurring.
  • the shortened interval time T2 is set, it is not always necessary to shorten the interval time for rotating the cooling fan 33 in the forward and reverse directions, and the normal interval time T1 may remain.
  • the cooling fan drive device 39 is a hydraulic drive type, but the present invention is not limited to this, and an electric drive type using an electric motor may be used. Further, the cooling fan 33 does not necessarily have to be driven by using the cooling fan driving device 39, and may be driven by being connected to the output shaft 30A of the engine 30.
  • radiator 31 and the oil cooler 32 have been described as one aspect of the cooling device, but the present invention is not limited to these, and for example, a torque converter oil cooler or the like may be included in the case of a torque converter drive type vehicle. ..
  • the wheel loader 1 has been described as one aspect of the work machine, but the present invention is not limited to this, and at least a cooling device for cooling the cooling water for cooling the engine 30 or the hydraulic oil for operating the work machine 2 is installed.
  • the present invention can be applied to any work machine (for example, a hydraulic excavator).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Component Parts Of Construction Machinery (AREA)
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  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
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US11401695B2 (en) 2022-08-02
JP2020159307A (ja) 2020-10-01
CN112639263A (zh) 2021-04-09
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US20210270016A1 (en) 2021-09-02
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